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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8ada484fb814c09e391e6e93b6c55af779710fa85a68370b7ac84e2eed5700e' 
  AND token = 'MGlwUbcruft/JajzBhZnUE8wMnbRELsQNDmo3Cx1/eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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