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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a537916b5dcfa404dd16b2ae5eba399d19d34dedd88745825d86bf0510fc653' 
  AND token = '4HMofB5NePZZ9JbhTCsY+KzVyatbwVPYe4QVR+9I6Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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