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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e252776e7e84c25f3c2ec0f281673b39ba264144c29c353c2b341878d0b93b74' 
  AND token = '/v028zKwY68rt/ZlchcKE+l9Q55gGS9eHNRFa4q07r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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