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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdda2f26b17a9ea81ad076fb89fe029829b6ead569953f303b3f0ca185d64f5a' 
  AND token = '/CVtBm0zLBQNa3+rvWBoEdryLjB1TrpGmUVBft5SJFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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