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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56ff2cb1678e0de9523f53aa27c342c8aa754582787236098752984db4b9a6de' 
  AND token = 'ZeG24U3pSAMU6WVB404bkH/lJCcWYVc+pi/x57fm2pI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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