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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecb2c6b94fd4dd75b5f2b0f0bc8ab4b0b2c24d61f6d8b791f58104409b8a8128' 
  AND token = 'jZ0LTYqbpAkKslInVB30S4+qLAquIIVquuyp1Er0j8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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