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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bdfe5a410e9dea7a0dc3561b50045903feae53aacdf50d87870994c28cc76bc' 
  AND token = '3QfJluECC/ovBG8UMPwfdC4oL69bx3ZADDeRvIu0Yn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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