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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bcbbe9499491dca0e446895b0f1f6a156a03a93c23e8f39f836f1d9568a93df' 
  AND token = 'CDnQ5Zu4RR6i1uZ6ioFU3yGIuuNzosDu59GPiFiNzdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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