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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc7bb7a4a30d3cb1db92af95c5ab77cdb7396dd33880bdd12932264290e34a6b' 
  AND token = '1Cf62+owcXumDvlcuG5K366TtbCLJM9NQnp+TN5gQcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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