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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb1d6e7bdbe329cd9662ae90b4d27e37bd4c6e3e79af64e15d09e9d0d5908fe7' 
  AND token = 'dZek6QLBYctoyv4tuV6BFO25j0FJwSJz5/u1TIDjIAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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