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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '104ef9f9c7c6e78a4b28240b04a39dd101a16d3b45ee0346afa4054c5e414d5e' 
  AND token = 'boKp4583J/+EQJ5khhA1pQi0jnQqXX9MhpVvzpnmcz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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