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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29a94fed091e2a0c0823b7e921466c0fd97d2fd81e502697428474398286782d' 
  AND token = '91FSksmg50H+GjYHGyZMuNmyY/+6oxS/R2ypH3kR7Kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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