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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e44caa215b73444d0c4adf1e1ae077ea43b801fedfb66d6d23556137bdb345fe' 
  AND token = 'tOC0HvrPdvE/OQR2sOUTdTC1ClpN686k+EAbHGVqnJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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