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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80a764383e8e1f9ed90ac90d754ac3edb7db300327bb3321e833548e4b648cda' 
  AND token = 'SytX8C7TxI40xUsmZQCxSMPJv5ikJ2QN9Wk83IPaJP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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