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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7994acd8f2f21da9b3cd66d5925ffe72c0f6d61d61539830f3cd797b405b14a8' 
  AND token = 'aqTIz2MjccMA5NPoPankbb4GZkTPjAEO6WIVaZpEPSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}