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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fcbae19a1d4032e3bda1ff7e1cfe0803a0f9d066e3af9cff296ba625bec47be' 
  AND token = 'bqmxvp+D6KGy+iMCDeWhX6tpng24rblH/T17UIyXhN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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