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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10c4c40aa3a527050fed71cec9702ce25760423c1682034e02eb615f5f98c8d8' 
  AND token = 'WUc1QBO6h48clpZS4sCi95ib9/p2W1EsXJ2B1qcayRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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