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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ff418c139cde8bb1e326ba677c5cff11e3712b8cef95275e291c8d7d329d9c' 
  AND token = '4mpjIM8bOy2pqfhvcLaf8va+lBlr9O+3uT0sEQ0FCLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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