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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30dc498a1693c3ea4731f1744395244266382764a2e36347141ecd3e055f1f4f' 
  AND token = '4UzOIhLj6Z8IFFW631z+oP2sfFdJHlFKvcMyYjspqKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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