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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5f2a3e0b61a009bb78df91bdcf3d918be1d3513c1321e98c3f2f34aab043030' 
  AND token = 'z/gDMLG1lcoJouHZZLRt2smOcXgvv7bdObYJgI0y5Bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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