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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a0802132a01a0a1e88e1bb57bddd71d187b689d387ba02a93baf83e5006bba9' 
  AND token = 'PFYrL1cRiR6T9AxOf2jR1ZAqYb81FmG2vPffPan7qzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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