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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e70b64829f03d8c40aa99ddd8374f330389afec8ce591166c1a307f2ed24cfef' 
  AND token = 'ksUzWeQ5ZoyIX+UCHXVCXIX4gsvoXzek2QG7R7iGXSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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