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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d8842abbef548b68462018833d49ef11af8ee35953fd743afeee8a2f6643318' 
  AND token = 'vAmFlJq+Jk4bMuEQ7QfcVcalcXXdjPTLIvcKyq4gjdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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