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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ffc33136ec8d97369601993f31d0cbe9724579640a4bc8f1e34a4cc72fe6a79' 
  AND token = 'q8nvMkVeOmsB+9on6NOT5su3XnHRoW8GIOx3TLb7qU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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