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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e98a66806c8453eeb34c0fb0eff6a9114525866c9d2352d3191e9e00dc3e58f1' 
  AND token = 'ImmCc1v2dmBFBDHc1Vxbt0bkxi/UBj/iQfWW9wNC/Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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