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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34303d1048a62822b4b2d73b46baf832e16d3359b39df1d1f0727946f898445d' 
  AND token = 'H8jQ47HE6RR0B6e1wzPiqttFC8gECsAu2JjzkyzkuSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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