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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60ea215b6e676916e9a597b7ffb7e0cfe3cf27c46acf06d7e4ed49f6b92adab4' 
  AND token = 'pGJstd/YU9/RJioL2LtOAU6Us7qY7iDtnQb+mbdIvKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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