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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04f7a6ff00cc651173fcfa2fb19161b48688ddc71c9f67602216dad3d1b0014a' 
  AND token = '7LPLNpw2Ab7bqNHOrIZn00PhXS2SDrQj4m4uJZ8P09M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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