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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '131afb0fd3ba173b1293dd2f4eba12f31656750c3b7bb07a9eafde93fdb888d8' 
  AND token = 'MByMlbMe2PSY4UfeBCg6ycNgcRYrgKOWjgsqBjgqNBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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