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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e761395d30677e1673f1c71c147cd20550f7afb3a534c0bd2d86f0d88a40c32' 
  AND token = 'jNh/kZmfv3civFyeJXWb7m4lVPw3PLK154gSjlfVdaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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