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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9861df4d7193223a7c93e802d60946b593f231efbe8160f36639655ac56bdd28' 
  AND token = 'TSGGBM9XJphXfKBRmL/kXPGZ0epfXrioiyOXmwTds1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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