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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebf6295224c2cffe895a4643bb5b66b9077f05bd231f15b28997f4f922491557' 
  AND token = 'TzrsVcnpo0O8/t1olCz0U8zSuk7Dn5wS9F9MLclciR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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