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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b95c73cc81aad907b5e35bfd1b5b9f5931ae64aefd116f2460389441df42a6ac' 
  AND token = 't04GcC8cmpxUxX9PQQIJS4xbz5dsR+Y05JBi8+7DoRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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