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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ea0d5e0e611ca4d84f0170372440e4a638f2ca0af6f28ee7ef72db11df69904' 
  AND token = 'aSMMPChlOKiMyytQ7aQA82EQCJWfUnEHG/owOcUO+Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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