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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1387dfd9ea570b8710d69baba7a0bb9dde80615704d7d0d5b866112ddc8c470' 
  AND token = 'i02mF3vuldHfjoIWcWMevqnW5OCytvQ2ZywFMOGYEtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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