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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff782ae9ff3f1d2f76d20251a4094ea823f2ab3df956ce0867989a5d91ab2acb' 
  AND token = 'tOtyiIVHMPl82fzQ7WFoQTv/up4XGuHHNbzt+i8JJrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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