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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5a3572544e2874596e4ca2f65cdf2b1b47d52ea5d75bec3d36a8caf8022e0d3' 
  AND token = '94DYxP9Y4+vaTALAUqFG3lGP6VTAENwfbLHJoBGKGT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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