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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43715759a0ecd095c5e10801d1398e98e57b28c7d725da60fe4534711e72b30c' 
  AND token = '+W3EUrxNVBLUqH9zWKJCkZ01dJpTOQOtcMl1p8luvnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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