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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f81da787d166311007626f4d7b38c0b20f08ae271aa9b63a0e6d9793150e57c' 
  AND token = 'g09RdD62qb2FCo3+c9CPv0QhbueYgwposB+AkxBNJJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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