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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af9fb275820928f8f91d294b626ad8beca40051e734cbb0a8106a5938c110f8b' 
  AND token = '8W2tFgJ3pXae3VTpEKfhnOFoKo8l55mKX2n5iOIa9zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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