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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b950f2e42501c142d0e6f822c09344061ac07133b324bb534a1467558a434061' 
  AND token = 'mPVK+ZmExID5MccQ0iEYzuTDQ3tBNrqr6d+6KQdtges=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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