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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2e645f00f842b407ce4bab37ecbe7403972965b234ab2d23275c808b14ad4a9' 
  AND token = '8i4nzD2dkVADz/ECr01W6Zt7erH+OdWBQk6Nk9oy3i4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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