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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ca6002a6c6ebf2961720ee756937cbe26caf256b1eb024eb7e0a19aa943291e' 
  AND token = 'Te3M5ukSr4oPKyuBIO4XgUKM2V7o5Ge7H1mDcpflZvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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