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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dedb39267408a8a0b2301bf5856715a61ccb899b6e0393c372194f66c6178ea7' 
  AND token = 'fSl+3AHx5Pkm9CdllBwa/bOPXb/Qd98fzd0w77oXsXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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