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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d252d78b72abc3b1c56e2c6fbff9f4228a34d3226bc087946f0cb0f81d57b5' 
  AND token = 'vntIKAM9JyKnNN+7T7iG+4kakXPMU3Mlp8KA2I92Bv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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