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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c359f9caaf1299a3b16af12e5b62a4a98c3d62bba349542bd84b530c05274480' 
  AND token = 'msv3jYnLuIzbEY5ONfR5kFyYdOdiylnok6Os70n/sTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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