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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f36edd29d5620b58cf7341aef10b0bc00a5f0bae07e97be599d1fc3f31f25e1' 
  AND token = 'fGsl+IJbaI8/eVzOIdFfZ2ZSH2R0P0tXdpVsA7ka0dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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