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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '323e3cd873eb9937fab70a34816c4f91ad5bebf5377b50bd1538f9e89232e842' 
  AND token = 'NhVCQCvNpp1RU9BtvVGEAi4i0i1177+lQAncrtfTtYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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