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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd31fa54b646a30460207c000236dfc36614985db944d38c9ca9362ff24b5f1' 
  AND token = 'eAuxs0VJAiKLYR0EMf6ynjDZqQQzhr9w8odPX63/vAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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