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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63c3608115a3f5e9b3a98fe44db6a706df8728f4b3442c340602c4e63176aeba' 
  AND token = 'AxGWsuSuoutOOQP88h6qlSTpQBMXGUGhtTRyHM2TzEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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