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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1f132694124a5ebfc35b2b1261975e4955b41f75173560296d4e247d667790a' 
  AND token = 'r57D4Gl0R04BT3Fa2RaO3dC3GtUu2AvUXgKtkRdTvKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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